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@ffm
46/17 is 73.1 gear inches (GI), 44/17 is 69.9GI, 42/17 is 66.7GI or 46/18 is 69.0GI. All within sensible range. An 18T sprocket should be easy to find too.
http://sheldonbrown.com/gears/
http://software.bareknucklebrigade.com/